<template>
  <div>
    <ul>
      <li v-for='(item,index) in arr' :key='index'>
        {{ item }}
      </li>
    </ul>
    <button @click='addFn'>走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: ['帅哥', '美女', '程序员']
    }
  },
  methods: {
    addFn() {
      this.arr.push(this.arr.shift()) 
    }
  }
}
</script>

<style>

</style>